Incidence of sexually transmitted infections and association with behavioural factors: Time-to-event analysis of a large pre-exposure prophylaxis (PrEP) cohort.

OBJECTIVES Our objective was to obtain long-term data on the incidence of sexually transmitted infections (STIs) and their association with behavioural factors after widespread pre-exposure prophylaxis (PrEP) implementation. METHODS This was a time-to-event analysis of a national PrEP cohort in Switzerland (SwissPrEPared study). Participants were people without HIV interested in taking PrEP with at least two STI screening visits. Primary outcomes were incidence rate of gonorrhoea, chlamydia, and syphilis. The association between behavioural factors and STI diagnosis was expressed using hazard ratios. We adjusted for testing frequency and calendar year. RESULTS This analysis included 3907 participants enrolled between April 2019 and April 2022, yielding 3815.7 person-years of follow-up for gonorrhoea (15 134 screenings), 3802.5 for chlamydia (15 141 screenings), and 3858.6 for syphilis (15 001 screenings). The median age was 39 years (interquartile range [IQR] 32-47), 93.8% (n = 3664) identified as men who have sex with men (MSM). The incidence was 22.8 (95% confidence interval [CI] 21.3-24.4) per 100 person-years for gonorrhoea, 26.3 (95% CI 24.7-28.0) for chlamydia, and 4.4 (95% CI 3.8-5.1) for syphilis. Yearly incidence rates decreased between 2019 (all bacterial STIs: 81.6; 95% CI 59.1-109.9) and 2022 (all bacterial STIs: 49.8; 95% CI 44.6-55.3). Participants reporting chemsex substance use were at higher risk of incident STIs, as were those reporting multiple sexual partners. Younger age was associated with a higher risk of gonorrhoea and chlamydia. CONCLUSIONS Incidence rates of bacterial STIs decreased over time. Young MSM, those with multiple partners, and those using chemsex substances were at increased risk of STIs

Incidence of sexually transmitted infections and association with behavioural factors: Time-to-event analysis of a large pre-exposure prophylaxis (PrEP) cohort

OBJECTIVES: Our objective was to obtain long-term data on the incidence of sexually transmitted infections (STIs) and their association with behavioural factors after widespread pre-exposure prophylaxis (PrEP) implementation. METHODS: This was a time-to-event analysis of a national PrEP cohort in Switzerland (SwissPrEPared study). Participants were people without HIV interested in taking PrEP with at least two STI screening visits. Primary outcomes were incidence rate of gonorrhoea, chlamydia, and syphilis. The association between behavioural factors and STI diagnosis was expressed using hazard ratios. We adjusted for testing frequency and calendar year. RESULTS: This analysis included 3907 participants enrolled between April 2019 and April 2022, yielding 3815.7 person-years of follow-up for gonorrhoea (15 134 screenings), 3802.5 for chlamydia (15 141 screenings), and 3858.6 for syphilis (15 001 screenings). The median age was 39 years (interquartile range [IQR] 32-47), 93.8% (n = 3664) identified as men who have sex with men (MSM). The incidence was 22.8 (95% confidence interval [CI] 21.3-24.4) per 100 person-years for gonorrhoea, 26.3 (95% CI 24.7-28.0) for chlamydia, and 4.4 (95% CI 3.8-5.1) for syphilis. Yearly incidence rates decreased between 2019 (all bacterial STIs: 81.6; 95% CI 59.1-109.9) and 2022 (all bacterial STIs: 49.8; 95% CI 44.6-55.3). Participants reporting chemsex substance use were at higher risk of incident STIs, as were those reporting multiple sexual partners. Younger age was associated with a higher risk of gonorrhoea and chlamydia. CONCLUSIONS: Incidence rates of bacterial STIs decreased over time. Young MSM, those with multiple partners, and those using chemsex substances were at increased risk of STIs

Erratum: Die bedeutende nicht-proteinogene Aminosäure Norleucin und ihre komplizierte Namensfindung: Chemical Education

Inhaltliche Richtigstellung zu folgendem Beitrag in der Chemical Education-Reihe: C. A. Vock, Chimia 2021, 75, 443–445, https://doi.org/10.2533/chimia.2021.443

Addition Reactions to Unsaturated Fatty Acids: A Theoretical Study about Mechanisms and Stereochemistry: Chemical Education

After a short introduction about fatty acids, the article refers to an unclear statement by Gibson et al. about the kind and number of isomeric products formed by addition of hypochloric acid to palmitoleic acid and linoleic acid. A theoretical approach with detailed mechanistic and stereochemical considerations will lead the reader to the solution of the problem

Die bedeutende nicht-proteinogene Aminosäure Norleucin und ihre komplizierte Namensfindung: Chemical Education

Im Rahmen einer didaktischen Einordnung der bedeutenden nicht-proteinogenen Aminosäure Norleucin in die Familie der konstitutionsisomeren Leucine werden Vorkommen in Naturstoffen und Pharmaka sowie insbesondere die komplizierte historische Namensfindung der Verbindung dargestellt

L-2-Amino-3-phosphonopropionsäure (AP-3): ein bedeutendes Phosphor-Analogon der L-Asparaginsäure: Chemical Education

Im Artikel werden didaktisch nützliche Informationen zu Eigenschaften, (Bio)synthese und Anwendungen der L-2-Amino-3-phosphonopropionsäure (AP-3) zusammengestellt. Das Material ist zur Ergänzung chemischer Grundlagenvorlesungen im Hochschulbereich, aber ggf. auch für spezialisiertere Unterrichtseinheiten gedacht und einsetzbar

L-tert-Leucin als Konstitutionsisomer der proteino-genen Aminosäuren L-Leucin und L-Isoleucin: Herstellung sowie Vorkommen in Naturstoffen und als Baustein in Pharmaka: Chemical Education

L-tert-Leucin wird mit wichtigen Zusatzinformationen zu Herstellung, Vorkommen und Verwendung als Konstitutionsisomer der proteinogenen Aminosäuren L-Leucin und L-Isoleucin vorgestellt

Addition Reactions to Unsaturated Fatty Acids: A Theoretical Study about Mechanisms and Stereochemistry

After a short introduction about fatty acids, the article refers to an unclear statement by Gibson et al. about the kind and number of isomeric products formed by addition of hypochloric acid to palmitoleic acid and linoleic acid. A theoretical approach with detailed mechanistic and stereochemical considerations will lead the reader to the solution of the problem

Der Fried-Prozess als Quelle von 9alpha-Fluorglucocorticoiden: Chemical Education

Das von Josef Fried erfundene Verfahren zur Einführung von 9a-Fluorsubstituenten in Glucocorticoide wird erläutert und ein kurzer Einblick in das Leben dieses bedeutenden Synthetikers und Wirkstoffforschers gegeben